properties of quadrilaterals (geometry)

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10 Terms

1
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trapezoid area formula

A=(b1+b2)x1/2h

2
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parallelogram area formula

A=b x h

3
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rhombus area formula

A=d1 × 1/2d2

4
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square area formula

A=b x h

or

A=s2 (side squared)

5
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trapezoid

  • 1 set of parallel sides

  • congruent diagonals

6
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isosceles trapezoid

  • 1 pair of parallel sides

  • 1 pair of congruent non-parallel sides

  • congruent diagonals

7
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parallelogram

  • both pairs of opposite sides are equal

  • opposite angles are equal

  • can also be a rhombus, square, rectangle

  • diagonals bisect each other

  • each one divides the shape into 2 congruent triangles

8
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rhombus

  • 4 equal sides

  • equal opposite angles

  • can also be a parallelogram, kite, and sometimes a square

  • diagonals are perpendicular bisectors of each other

  • diagonals are congruent

9
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rectangle

  • 4 right angles

  • opposite sides are parallel and equal in length

  • can also be a parallelogram (sometimes) and a square (sometimes)

  • diagonals are congruent

  • diagonals bisect each other

  • divide the rectangle into 4 triangles

10
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square

  • 4 equal sides

  • 4 right angles

  • can also be a rectangle (sometimes) and a rhombus

  • diagonals are congruent

  • diagonals are perpendicular

  • diagonals bisect each other